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Consolidated Statements of Cash Flows
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 569 $ 189 $ 1,140
Adjustments to reconcile net income to net cash provided by operating activities:      
Deferred income taxes 139 90 (309)
Depreciation 474 423 383
Impairment of Long-Lived Assets Held-for-use 0 319 0
Amortization 51 46 41
Stock-based compensation 31 28 29
Changes in certain operating assets and liabilities:      
(Increase) decrease in receivables (3) 46 (52)
(Increase) decrease in inventories, prepaid and other 188 (178) 21
Increase in air traffic liability 118 131 101
Increase (decrease) in accounts payable and other accrued liabilities (91) 103 47
Other, net (27) 3 (22)
Net cash provided by operating activities 1,449 1,200 1,379
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (932) (908) (1,074)
Predelivery deposits for flight equipment (224) (206) (128)
Purchase of held-to-maturity investments (374) (429) (207)
Proceeds from the maturities of held-to-maturity investments 534 505 244
Purchase of available-for-sale securities (1,000) (979) (245)
Proceeds from the sale of available-for-sale securities 880 875 444
Other, net (13) (15) (13)
Net cash used in investing activities (1,129) (1,157) (979)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from issuance of common stock 51 48 48
Issuance of long-term debt 981 687 0
Repayment of long-term debt and finance lease obligations (323) (222) (194)
Acquisition of treasury stock (542) (382) (390)
Other, net (2) 0 0
Net cash provided by (used in) financing activities 165 131 (536)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 485 174 (136)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 1,018 533 359
Cash and cash equivalents at end of period 959 474 303
Restricted cash 59 59 56
Supplemental Cash Flow Information [Abstract]      
Interest Paid, Excluding Capitalized Interest, Operating Activities 62 59 60
Income Taxes Paid, Net (52) 11 139
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 7 $ 20 $ 51